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WAAS handles VOD traffic like any other TCP payload. If multiple users request the same video, repeated chunks of traffic will be serviced via the DRE cache and will be offloaded from the WAN. Traffic will also get TCP optimization via TFO and LZ can be applied, however it may not help too much.

Please note, this does not offload the users connection from hitting the origin server like a video cache (ACNS), but it should minimize repeated payloads hitting the wan and causing congestion.